taru-adjective, adverb taking the 'to' particle
eloquent; fluent; smooth-spoken
Describes speech or writing that flows smoothly and gracefully. Often used in literary or formal contexts. The word is a たる adjective and can also be used adverbially with と.
彼の演説はえんてんとして、聴衆を魅了した。
His speech was eloquent and captivated the audience.
taru-adjective, adverb taking the 'to' particle
Specifically used for eyebrows that are gracefully curved and well-shaped. This is a rare, literary usage.
彼女の眉はえんてんとして美しい。
Her eyebrows are shapely and beautiful.